Double Declining Balance (DDB) Depreciation is an accelerated depreciation method used in accounting. It allocates a larger portion of an asset’s cost to the earlier years of its useful life. By doubling the straight-line depreciation rate and applying it to the asset’s decreasing book value each year, DDB reflects the rapid decline in value. Ideal for assets that quickly lose value or become obsolete, it provides a more accurate expense representation, benefiting financial planning and tax strategies.